Fig 1.
Map of newfoundland and southern labrador with sampling locations.
The sampling locations are indicated for the 2013 (open symbols) and 2015 (closed symbols) locations within the Hawke Channel (HC, triangles), Notre Dame Channel (NDC, circles), and Bonavista Corridor (BC, squares). The inset map outlines the study domain in eastern Canada. The relevant NAFO subdivisions 2J, 3K, and 3L boundaries are also indicated. Dashed lines represent 300 m depth contours. The bathymetry map is reproduced from GEBCO world map 2014 (www.gebco.net) and NAFO subdivisions reproduced from NAFO (www.nafo.int).
Table 1.
Set details and diversity indices for 2013 Celtic Explorer data.
Most abundant species (numbers, biomass) represents lists of the most frequently observed species pooled among sets within each region. Mean species richness and Simspon’s reciprocal were generated based on all trawl sets with regions.
Table 2.
Set details and diversity indices for 2015 Celtic Explorer stomach data.
Mean diet species richness and Simpson’s reciprocal evenness data based on pooled fish samples within regions.
Table 3.
Definition of small, medium and large size categories for each species.
Fig 2.
Nitrogen isotopic values across the seven species and three size classes (small, medium, large).
Lines were fitted using local polynomial regression (α = 0.5) and the line type indicates region (solid: Bonavista Corridor; dashed: Notre Dame Channel; dotted: Hawke Channel). Error bars represent the standard error (except for Notre Dame thorny skate due to low sample size). For definitions of size categories, refer to Table 3.
Fig 3.
Carbon isotopic values across the seven species and three size classes (small, medium, large).
Lines were fitted using local regression (α = 0.5) and the line type indicates region (solid: Bonavista Corridor; dashed: Notre Dame Channel; dotted: Hawke Channel). Error bars represent the standard error (except for Notre Dame thorny skate due to low sample size). For definitions of size categories, refer to Table 3.
Fig 4.
Bayesian ellipses for the seven species with all size classes combined.
Individual panels represent: (a) Bonavista Corridor, (b) Notre Dame Channel, and (c) Hawke Channel. The star represents the community centroid within each region.
Fig 5.
Bayesian ellipses for the seven species within the Bonavista Corridor separated by size class.
The star represents the community centroid. Panel A shows the interconnection of species within the community and panel B shows the specific behaviours of each species with regards to size.
Fig 6.
Bayesian ellipses for the seven species within the Notre Dame Channel separated by size class.
The star represents the community centroid. Panel A shows the interconnection of species within the community and panel B shows the specific behaviours of each species with regards to size.
Fig 7.
Bayesian ellipses for the seven species within the Hawke Channel separated by size class.
The star represents the community centroid. Panel A shows the interconnection of species within the community and panel B shows the specific behaviours of each species with regards to size.
Table 4.
The proportion of observed overlapped Bayesian ellipses, mean % overlap area of ellipses (± SE) and mean and standard deviation for distance to nearest neighbour (DNN; ± bootstrap CI).
Table 5.
Mean distance to the centroid (± SE) by region for size-pooled (Fig 4) and size-divided ellipses (Figs 5–7).